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The catalytically active components of a series of Fe_2O_3-Sb_2O_4 mixed oxide catalysts with differentSb/Fe ratio,calcined at elevated temperature,as well as with or without support,have been investigated byX-ray diffraction analysis,Mossauer spectroscopy and XPS in order to elucidate their catalytic behavior inammoxidation of propylene.Correlations of acrylonitrile yield with Fe~2+ and Fe~3+ respectively showed that,FeSbO_4 seems to bethe basic active component of catalyst,upon which the formation of new phase containing Fe~3+ is responsiblefor a good selective oxidation.
The catalytically active components of a series of Fe 2 O 3-Sb 2 O 4 mixed oxide catalysts with different Sb / Fe ratios, calcined at elevated temperatures, as well as with or without support, have been investigated by X-ray diffraction analysis, Mossauer spectroscopy and XPS in order to elucidate Their catalytic behavior inammoxidation of propylene. Corlations of acrylonitrile yield with Fe ~ 2 + and Fe ~ 3 + individually showed that, that the formation of new active phase containing Fe ~ 3 + is responsiblefor a good selective oxidation.